<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>模拟一个数据监测</title>
</head>
<body>
    <script>
        let data = {
            name: '尚硅谷',
            address:'西安'
        }  

        //创建一个监视的实例对象，用于监视data中数据的变化
        const obs = new Observer(data);
        console.log(obs)
        const vm = {}
        vm._data = data = obs

        function Observer(obj){
            //汇总对象中所有的属性，形成一个数组
            const keys = Object.keys(obj);
            // console.log(keys)
            //遍历
            keys.forEach((k) => {
                Object.defineProperty(this,k,{
                    get(){
                        return obj[k]
                    },
                    set(val){
                        console.log(`${k} 被改了，我要去解析模板，生成虚拟DOM......`)
                        obj[k] = val
                    }
                })
            })
        }

    </script>
</body>
</html>